JPS60207777A - Vibration-proof handle device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a vibration-proof handle '34X suitable for the handle of a vibrating tool or vibrating machine such as a rock drill, a pitching hammer, or a leg drill.

[Technical background of the invention and its problems] In vibrating tools and vibrating machines such as rock drills, pitching hammers, leg drills, and hammer drills, harmful vibrations of the handles have become an occupational health problem. Various anti-vibration handles have been proposed to solve this problem, but
Conventional anti-vibration handles mainly have anti-vibration rubber or springs inserted between the tool body and the handle, and the natural frequency of the handle system is lowered than the excitation frequency of the tool body, thereby increasing the vibration isolation effect of the handle. I'm trying to give you. However, in this method, in order to lower the natural frequency of the handle system in order to enhance the vibration isolation effect, it is necessary to increase the weight of the handle or use a soft anti-vibration rubber or spring with a small elastic modulus. Therefore, it is not possible to simultaneously satisfy both of the requirements for light weight and operability (strength of the waist) for this type of handle.

[Object of the Invention] The present invention has been devised to effectively solve the above-mentioned conventional problems. An object of the present invention is to provide a vibration-isolating handle device that can sufficiently isolate a grip member, which is a handle portion, from harmful vibrations of a vibrating tool, etc., and that can achieve waist strength and weight reduction that are substantially similar to rigid body support. It's about doing.

[Summary of the Invention] In order to achieve the above object, the present invention is configured as follows. That is, a connecting member attached to the vibration source via a first elastic member such as rubber, a cylindrical grip member attached to the connecting member via a second elastic member such as rubber, and The gripping member includes a mass body provided in the gripping member, and an impact massing body provided within the gripping member so as to be able to collide with the inner wall surface of the gripping member.

[Embodiments of the invention] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a tube body that is attached to a vibration source such as a rock drill, and inside the tube body 1 is a first elastic member 2 made of cylindrical rubber as shown in FIG. is inserted into the first elastic member 2, and the seizure is fixed.Nuts 1 to 3°3 are embedded and fixed in the first elastic member 2 along the axis from both end faces of the first elastic member 2.The nut body 3 has a bottom. It has a cylindrical shape and has a female thread on its inner peripheral surface, into which the male threaded proximal end 4a of the rod-shaped connecting member 4 shown in FIG. 3 is screwed. The distal end 4b of the connecting member 4 is embedded in a second elastic member 6 made of rubber filled in the proximal end side of the cylindrical grip member 5.The distal end 4b is embedded in a second elastic member 6 made of rubber. The distal end portion 4.b of the connecting member 4 is secured so that it does not fall off from the member 6.
A tsuba 4C is formed on the holder.

A partition wall 5a is formed at the center of the grip member 5, and
A mass body 7 is attached to the tip of the grip member 5 so as to cover the opening thereof.
The hollow chamber 8 in the grip member 5 between the partition wall 5a and the mass body 7 is provided with a roughly cylindrical impact mass 9.The impact mass m body The radial dimension of the impact mass 9 is slightly smaller than the inner diameter of the grip member 5, and the axial dimension is also slightly smaller than the dimension between the mass body 7 and the partition wall 58. It is provided so that it can vibrate within the grip member 5 and collide with the inner wall surface of the grip member 5 and the mass body 7.

Next, the operation of this embodiment will be described.

Harmful original vibrations from a vibration source such as a rock drill are input into the pipe body 1. The original vibration input to the tube body 1 is transmitted to the first elastic member 2
J: is attenuated and transmitted to the left and right connecting members 4.4, respectively. The connecting member 4 vibrates in substantially the same phase as the original vibration. Furthermore, the vibration of the connecting member 4 is transmitted to the grip member 5 via the second elastic member 6. However, a second elastic member 6 is interposed between the connecting member 4 and the proximal end of the grip member 5, and a mass body 7 and an impact mass body for suppressing vibration or displacement are provided on the distal end side of the grip member 5. 9 has been set up.

Therefore, by appropriately selecting the elasticity of the second elastic member 6, the quality M1 of the material 7, the impact material 9, or the length of the grip member 5, the connecting portion 4A4J: the grip that vibrates with a delay. The distal end side of the member 5 vibrates at the same frequency and in an opposite phase to the connecting member 4. That is, the connecting member 4 is vibrated by the original vibration and becomes a vibration antinode, but a vibration node is formed on the tip end side of the grip member 5. Therefore, the original vibration from the vibration source is effectively attenuated, and the tip side of the grip member 5, which is the substantial handle portion, hardly vibrates.

By the way, the vibration mode in which the connecting member 4 is a vibration antinode and the tip side of the grip member 5 is a vibration node is limited to a relatively narrow frequency range. However, in actual vibrating tools, due to load fluctuations, etc., a certain degree of vibration frequency fluctuation is unavoidable during use. For this reason, the vibration mode described above may not be realized, and the tip side of the grip member 5 may be vibrated.

However, in the present invention, since the impact mass body 9 is provided within the grip member 5, a vibration damping effect can be obtained over a fairly wide frequency range.

That is, when the frequency of the original vibration of the vibration source changes and the tip side of the grip member 5 is excited, the impact mass body 9 in the hollow chamber 8 vibrates at a phase different from that of the grip member 5, and the impact mass The body 9 collides with the grip member 5, the partition wall 5a, or the mass body 7. Due to this collision, vibrations on the tip side of the grip member 5 are suppressed or damped. Therefore, even against relatively wide frequency fluctuations of the vibration source, the tip side of the grip member 5, which is the substantial handle portion, can be effectively damped from vibration. In addition, the impact material m body 9 and the grip member 5
If the gap with the inner wall surface, etc. of If it is made too large, the frequency of collisions of the impact mass body 9 will decrease, making it impossible to suppress vibrations of the grip member 5.

FIG. 4 shows the measurement results of the vibration acceleration transmitted to the conventional handle of a rock drill, and FIG. The measurement results of the vibration acceleration transmitted to the tip side are shown. (In Figures 4 and 5, the units of the horizontal and vertical axes are seconds and gravitational acceleration, respectively.) As is clear from the comparison between Figures 4 and 5, the information was transmitted to the conventional handle. Violent harmful vibrations are drastically reduced to extremely weak vibrations in the anti-vibration handle device of the present invention. This vibration-proofing effect is equally observed in both radial and axial vibrations of the grip member 5.

FIG. 6 shows a second embodiment of the anti-vibration handle device according to the present invention.

In the same figure, reference numeral 10 denotes a replay 1- that is attached to a vibration source such as a leg drill with bolts, etc.
1 is attached to each. The tube body 11 is filled with a first elastic member 12 made of rubber. Pipe body 11.
Between 11 and 11 is a cylindrical grip member 13 with a slightly enlarged diameter at the center.
is provided coaxially with the tube body 11. Grip member 13
A second elastic portion 1114.14 made of rubber is filled at both ends of the tube. The grip member 13 is supported by a rod-shaped connecting member 15 that is passed between the second elastic member 14, the first elastic member 12, and the notch. The inner end of the connecting member 15 is embedded and fixed in the second elastic member 14 . Further, the outer end of the connecting member 15 is provided with a groove passing through the first elastic member 12, and a fixing nut 16 is attached to the outer end.

A sleeve 19 is provided at a penetrating portion of the first elastic member 12 through which the connecting member 15 passes. Annular pads 17 are attached to the outer periphery of both ends of the folding member 13. Furthermore, the grip member 13 has a partition wall 13a to define a hollow chamber in the center thereof.

13a is formed, and an impact mass body 18 whose diameter is slightly smaller than the inner wall surface of the grip member 13 is provided in the hollow chamber so as to be able to collide with the inner wall surface of the grip member 13.

The original vibration of the vibration source is the mounting plate 1 to 10. After passing through the pipe body 11, it is further attenuated by the first elastic member 12, and the connecting member 15
can be conveyed to. The connecting member 15 vibrates at substantially the same phase and frequency as the original vibration, although the amplitude is smaller than the original vibration.

Although the connecting member 15 vibrates relatively violently, the second elastic member 14. Due to the presence of the impact mass 18, the gripping member 13
The central portion of the connecting member 15 is later than the connecting member 15 and has an opposite phase, forming a vibration node. In this way, the central portion of the grip member 13, which is essentially the handle portion, is sufficiently vibration-proofed with almost no vibration. In this embodiment, the mass body 17 is connected to the connecting member 15.
from the tip of the grip member 13 via the second elastic member 14.
It is thought that it acts as an inertial mass that suppresses the vibrations transmitted to the ends of the tube. The vibration suppression effect due to the collision of the impact mass body 18 is similar to that of the above embodiment.

Figure 7 shows the measurement results of vibration acceleration transmitted to a conventional handle attached to a leg drill. on the other hand,
FIG. 8 shows the measurement results of the vibration acceleration transmitted to the central part of the support member 13 when the vibration-proof handle device of the second embodiment is attached to the same leg drill. An extremely good vibration damping effect was confirmed in this example as well.

Next, FIG. 9 shows a third embodiment of the present invention. In the figure, reference numeral 20 denotes a bottomed cylindrical attachment body that can be attached to a vibration source such as a pitching hammer.

The mounting body 20 also serves as a supply unit that supplies compressed air for operation to the vibrating tool main body, which is a vibration source.
A tube 21 for supplying pressurized air to the mounting body 20 is attached to the side wall of the mounting body 20 . The tube 21 is curved to form a handle, and a cylindrical grip member 23 is attached to the distal end of the tube 21 via an elastic member 22 made of rubber. .

An impact material 24 is provided on the distal end side of the grip member 23 so as to be able to collide with it. Further, a connecting portion 25 for attaching a hose for supplying pressurized air is formed at the tip of the grip member 23. Further, the tube 21 between the mounting body 20 and the grip member 23 is provided with an on-off valve 26 for opening and closing the pressure passage. The on-off valve 26 includes a valve body 27 having a through hole, a spring 29 that presses the valve body 27 against the valve box 28, and supports the valve body 27.
It mainly consists of a lever 3o for operating the Note that a through hole is formed in the impact material m body 24 through which pressurized air can pass. The original vibration of the vibration source is from the mounting body 2° to the tube 21.
However, due to the presence of the elastic member 22 and the impact mass body 24, a vibration node is formed at the tip fif+m'J of the grip member 23, which serves as a substantial handle portion, and vibration isolation is achieved. Further, the effect of suppressing vibrations caused by collision of the impact material m body 24 can also be obtained.

FIG. 10 shows the measurement results of vibration acceleration transmitted to a conventional handle attached to a pitching hammer.

On the other hand, FIG. 11 shows the measurement results of the vibration acceleration transmitted to the tip side of the grip member 23 when the vibration-proof handle device of the third embodiment is attached to the same pitching hammer. It was confirmed that this example also had an excellent anti-vibration effect.

Incidentally, in the above embodiment, the impact material m bodies were all integrated, but they may be divided and constituted by, for example, a plurality of washers. In this way, collisions between the wafers also occur, making the collisions random, thereby further improving the vibration damping effect.

[Effects of the Invention] In summary, according to the present invention, there is an extremely good vibration damping effect against vibrations in a fairly wide range of frequencies, and furthermore, the waist strength is substantially close to that of a rigid body support, and the size and weight are reduced. It is possible to achieve excellent effects such as easy operation and high operability.

[Brief explanation of drawings]

FIG. 1 is a front view showing a first embodiment of a vibration-proof handle device according to the present invention, FIG. 2 is a vertical cross-sectional view of the inside of a tube that is the attachment part of the handle device to a vibration source, and FIG. FIG. 4 is a graph showing the vibration acceleration transmitted to the conventional handle of Iwatsuki, FIG. A graph showing the vibration acceleration transmitted to the tip end side of the grip member when the swing handle device is installed, FIG. 6 is a partially cutaway front view of the second embodiment of the present invention, and FIG. 7 is a diagram showing the conventional leg drill. A graph showing the vibration acceleration transmitted to the handle, FIG. 8, shows the vibration acceleration transmitted to the central part of the grip member when the vibration-proof handle device of the second embodiment of the present invention is attached to the same leg drill. FIG. 9 is a partially cutaway front view showing the third embodiment of the present invention, FIG. 10 is a graph showing the vibration acceleration transmitted to the conventional handle of a pitching hammer, and FIG. 11 is a graph showing the vibration acceleration transmitted to the conventional pitching hammer handle. It is a graph showing the vibration acceleration transmitted to the tip of the grip member when the anti-vibration handle device of the M3 embodiment of the present invention is mounted. In the figure, 2.6, 12.14.2'3 are elastic members, 4.1
5 is a connecting member, 5.13.23 is a grip member, 7.17 is a mass body, and 9.18.24 is an impact mass body. Patent applicant Yasuharu Minamidate Seiyamaguchi Patent attorney Nobuo Kinutani

Claims (1)

[Claims] A connecting member attached to the vibration source via a first elastic member such as rubber, a cylindrical grip member attached to the connecting member via a second elastic member such as rubber, and the grip member. 1. A vibration-proof handle device comprising: a steel body provided in the grip member; and an impact-proof body provided in the grip member so as to be able to collide with the inner wall surface of the grip member.